<!DOCTYPE html>
<html lang="en">
<head>
    <title></title>
</head>
<body>
    <a href="#" class="button button--bird">
        <div class="button__wrapper">
            <span class="button__text">ENTRY</span>
        </div>

        <div class="birdBox">
            <div class="bird wakeup">
                <div class="bird__face"></div>
            </div>
            <div class="bird wakeup">
                <div class="bird__face"></div>
            </div>
            <div class="bird">
                <div class="bird__face"></div>
            </div>
        </div>
    </a>
    <style>
        body {
            padding: 100px;
        }
        .button--bird{
            --main_color: #f4cf47;
            --sub_color1: #f4e19c;
            --sub_color2: #ff8108;
            --base_color: #000;
            --border_radius1: 60px 60px 40px 40px / 48px 48px 30px 30px;
            --border_radius2: 70px 70px 40px 40px / 48px 48px 30px 30px;
            --border_radius3: 40px 40px 40px 40px / 48px 48px 30px 30px;
        }
        .button {
            display: flex;
            justify-content: center;
            align-items: center;

            box-sizing: border-box;
            width: 280px;
            height: 80px;

            text-decoration: none;
            border: solid 3px #000;
            border-radius: 40px;
            background: var(--main_color);
            position: relative;
        }

        .button__wrapper{
            display: flex;
            justify-content: center;
            align-items: center;

            width: 100%;
            height: 100%;

            border-radius: 40px;

            overflow: hidden;
            position: relative;

        }
        .button__text{
            position: relative;
            font-size: 32px;
            letter-spacing: 4px;
            color: var(--base_color);
            transition: all .3s ease;
        }

        .button::before{
            content: '';
            position: absolute;

            right: 20px;
            margin: auto 0;
            width: 24px;
            height: 24px;
            background: var(--base_color); 
            clip-path: path('M24,12.02c0-1.09-.75-1.71-.81-1.77L11.17,.45c-.91-.74-2.21-.56-2.91,.42-.69,.97-.52,2.37,.39,3.11l7.12,5.81-13.7-.02h0C.93,9.77,0,10.76,0,11.99c0,1.23,.93,2.22,2.07,2.22l13.7,.02-7.13,5.78c-.91,.74-1.09,2.13-.4,3.11,.41,.58,1.03,.88,1.65,.88,.44,0,.88-.15,1.25-.45l12.04-9.76c.07-.06,.82-.67,.82-1.77Z');
            transition: all ease .2s;
        }
        .button--bird .button__wrapper::before,
        .button--bird .button__wrapper::after{
            content: '';
            position: absolute;
            bottom: 0;
            width: 130px;
            height: 38px;
            background: var(--sub_color1);
            transition: all .5s ease;
            clip-path: path('M13.77,37.35L.25,16.6c-.87-1.33,.69-2.91,2-2.02l12.67,8.59c.81,.55,1.91,.14,2.18-.81l2.62-9.33c.39-1.4,2.34-1.42,2.76-.02l3.6,11.99c.33,1.11,1.74,1.4,2.47,.52L49.38,.52c.87-1.04,2.53-.42,2.53,.95V23.7c0,1.13,1.2,1.83,2.16,1.26l12.75-7.51c.85-.5,1.94,0,2.13,.98l1.5,7.6c.2,1.03,1.37,1.51,2.22,.92l17.74-12.3c1.09-.75,2.52,.25,2.21,1.55l-2.44,10.2c-.26,1.09,.74,2.06,1.8,1.75l30.8-9.04c1.37-.4,2.42,1.26,1.49,2.36l-9.07,10.66c-.83,.98-.1,2.49,1.17,2.42l12.12-.68c1.6-.09,2.12,2.15,.65,2.8l-2.73,1.21c-.18,.08-.38,.12-.58,.12H14.97c-.48,0-.93-.25-1.2-.65Z');
        }
        .button--bird .button__wrapper::before{
            left: 0;
        }
        .button--bird .button__wrapper::after{
            right: 0;
            transform: rotateY(180deg);
        }

        .button:hover .button__wrapper::before{
            transform: translateX(-12px);
        }
        .button:hover .button__wrapper::after{
            transform: rotateY(180deg) translateX(-12px);
        }
        .button:hover .button__text{
            letter-spacing: 6px;
        }
        .button:hover::before{
            right: 14px;
        }
        
        .birdBox{
            position: absolute;
            top: -54px;
            display: flex;
            justify-content:space-between;
            align-items: flex-end;
            width: 180px;
            height: 56px;
        }

        .bird{
            position: relative;
            width: 56px;
            height: 36px;
            box-sizing: border-box;
            border: solid 3px #000;
            background: var(--main_color);
            border-radius: var(--border_radius1);
            animation: sleep 1s ease infinite alternate;
            display: flex;
            justify-content: center;
        }
        .bird__face{
            position: absolute;
            top: 15px;
            width: 12px;
            height: 6px;
            background: var(--sub_color2);
            border-radius: 50% 50% 50% 50% / 78% 78% 22% 22%;
            transition: .2s;
        }
        .bird__face::before,
        .bird__face::after{
            content: '';
            position: absolute;
            top: -4px;
            width: 8px;
            height: 2px;
            border-radius: 4px;
            background: #000;
        }
        .bird__face::before{
            left: -5px;
        }
        .bird__face::after{
            right: -5px;
        }
        .bird::before{
            content: '';
            position: absolute;
            top: -12px;
            left: 22px;
            width: 12px;
            height: 12px;
            background: #000;
            clip-path: path('M10.23,3.32c-3.54,.63-5.72,2.51-7.02,4.23-.33-1.58-.34-3.54,.93-5.12,.52-.65,.41-1.59-.24-2.11C3.24-.19,2.29-.08,1.77,.57c-3.82,4.77-.31,11.11-.13,11.42,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0-.01-.02,2.49,.04,2.52,0,.1-.14,1.54-4.82,6.59-5.71,.82-.14,1.37-.92,1.22-1.74s-.94-1.36-1.75-1.21Z');
        }
        .button:hover .wakeup{
            animation: wakeup .2s ease;
            animation-fill-mode: forwards;
        }
        .button:hover .wakeup .bird__face{
            top: 20px;
        }
        .button:hover .wakeup .bird__face::before,
        .button:hover .wakeup .bird__face::after{
            animation: eye 5s linear infinite;
        }

        .button:hover .wakeup:nth-child(2) .bird__face::before,
        .button:hover .wakeup:nth-child(2) .bird__face::after{
            animation: eye_2 5s linear infinite;
        }
        
        @keyframes wakeup{
            0%  {
                height: 32px;
                border-radius: var(--border_radius2);
            }
            100%{
                height: 56px;
                border-radius: var(--border_radius3);
            }
        }

        @keyframes eye {
            0%{
                top: -6px;
                width: 6px;
                height: 6px;
            }
            30%{
                top: -6px;
                width: 6px;
                height: 6px;
            }
            32%{
                top: -4px;
                width: 8px;
                height: 2px;
            }
            34%{
                top: -6px;
                width: 6px;
                height: 6px;
            }
            70%{
                top: -6px;
                width: 6px;
                height: 6px;
            }
            72%{
                top: -4px;
                width: 8px;
                height: 2px;
            }
            74%{
                top: -6px;
                width: 6px;
                height: 6px;
            }
            76%{
                top: -4px;
                width: 8px;
                height: 2px;
            }
            78%{
                top: -6px;
                width: 6px;
                height: 6px;
            }
            100%{
                top: -6px;
                width: 6px;
                height: 6px;
            }
        }

        @keyframes eye_2 {
            0%{
                top: -6px;
                width: 6px;
                height: 6px;
            }
            10%{
                transform: translateX(0);
            }
            12%{
                transform: translateX(3px);
            }
            20%{
                top: -6px;
                width: 6px;
                height: 6px;
            }
            22%{
                top: -4px;
                width: 8px;
                height: 2px;
            }
            24%{
                top: -6px;
                width: 6px;
                height: 6px;
            }
            25%{
                transform: translateX(3px);
            }
            27%{
                transform: translateX(0);
            }
            74%{
                top: -6px;
                width: 6px;
                height: 6px;
                transform: translateX(0);
            }
            76%{
                top: -4px;
                width: 8px;
                height: 2px;
                transform: translateX(3px);
            }
            78%{
                top: -6px;
                width: 6px;
                height: 6px;
            }
            80%{
                top: -4px;
                width: 8px;
                height: 2px;
            }
            82%{
                top: -6px;
                width: 6px;
                height: 6px;
            }
            85%{
                transform: translateX(3px);
            }
            87%{
                transform: translateX(0);
            }
            100%{
                top: -6px;
                width: 6px;
                height: 6px;
                transform: translateX(0);
            }
            
        }
        @keyframes sleep{
            0%  {
                height: 36px;
                border-radius: var(--border_radius1);
            }
            100%{
                height: 32px;
                border-radius: var(--border_radius2);
            }
        }
    </style>
</body>
</html>